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A highly sensitive refractive-index sensor based on the long-period grating pair with a fiber-taper in-between

Published: 29 July 2008 Publication History

Abstract

We report an improved structure of long-period gratings (LPGs), i.e. long-period grating pair with a fiber-taper in-between (LPGP-FTI), as a highly sensitive refractive-index sensor. Since a taper is introduced in-between the LPG pair, the guided core mode will be transmitted to a cladding mode as the fiber tapers down, and thus the evanescent field of the selected cladding mode in the external medium is increased. In this way the effective index difference is enlarged, so that the sensitivity can be greatly improved. The experimental results have shown that the sensitivity of the LPG pair to the change in the RI of the measurand can be efficiently improved by a fiber taper, and can be flexibly tailored by the tapering degree. Enhanced sensitivity, which is about five times higher than that of a normal LPG pair, is achieved in the experiment. Such a highly sensitive fiber-optic RI sensor is good for use as a chemical or biological sensor.

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  1. A highly sensitive refractive-index sensor based on the long-period grating pair with a fiber-taper in-between

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    ICAIT '08: Proceedings of the 2008 International Conference on Advanced Infocomm Technology
    July 2008
    677 pages
    ISBN:9781605580883
    DOI:10.1145/1509315
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    Published: 29 July 2008

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    Author Tags

    1. fiber-taper
    2. in-fiber mach-zehnder interferometer (MZI)
    3. long-period fiber gratings (LPGs)
    4. optical fiber sensor
    5. refractive index (RI) measurement

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    ICAIT '08 Paper Acceptance Rate 89 of 151 submissions, 59%;
    Overall Acceptance Rate 122 of 207 submissions, 59%

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